The animal that lives the longest is the Greenland Shark.
Greenland Sharks have an average lifespan of between 300 to 500 years.
The Greenland shark, also known as the gurry shark, grey shark, or by the Kalaallisut name eqalussuaq, is a large shark of the family Somniosidae, closely related to the Pacific and southern sleeper sharks.
The meat of a Greenland shark is poisonous.
Greenland shark meat can cause symptoms in humans similar to severe inebriation, and the neurotoxins in their flesh can even be incapacitating to sled dogs.
Greenland sharks are not considered dangerous to humans, in part because they live in regions where people do not typically swim; the only known report of a possible attack by a Greenland shark on a person dates to 1859.
Although they're fairly safe among other creatures, orcas and sperm whales are believed to feed on Greenland sharks since they have a significant amount of oil in their livers.
Dark gray, brown, or black with a cylinder-shaped body, small eyes, rounded snout, and no anal fin, Greenland sharks resemble a submarine and can reach 23 feet long and 1.5 tons.
In comparison, the great white shark grows to 15 to 20 feet but is significantly heavier, weighing 2.5 tons or more.
Another longest living animal in the ocean is the ocean quahog.
The ocean quahog is a fist-size clam that can live to be 500 years or older.
Some researchers believe the sturdy quahog's secret to a long life is its ability to protect its proteins from damage.